import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int k = sc.nextInt();
        HashMap<Integer, HashMap<Integer, Integer>> counts = new HashMap<>();
        for (int i = 0; i < n; i++) {
            int b = sc.nextInt();
            int c = sc.nextInt();
            if (!counts.containsKey(c)) {
                counts.put(c, new HashMap<>());
            }
            counts.get(c).put(b, counts.get(c).getOrDefault(b, 0) + 1);
        }
        int ans = 0;
        for (HashMap<Integer, Integer> tmp : counts.values()) {
            int max = 0;
            int total = 0;
            for (int x : tmp.values()) {
                max = Math.max(max, x);
                total += x;
            }
            ans += total - max;
        }
        System.out.println(ans);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}